Piston-packing.



C. i. E. MASTIN.

PISTON PACKING.

APPLIQATION man ocT. 6. 1915.

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CHARLES I. E. 'MASTUL 0F MIDLAND PARK, NEW JERSEY.

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application med october 6, 191;;5. Serial No. 54,291.

To all whom it may concern:

Be it known that l, CHARLES ll. E. Mas- ...Ti.N, a citizen of the UnitedStates, and

frcsident of Midland Park, county of Bergen, and State of New Jersey,have invented certain new and useful Improvements in Piston-Packing, ofwhich the following is a specification.

This invention relates to a packing for piston rods and other movingpartsof engines and machinery where a tight joint is required to preventthepassage of steam or other fluid under pressure.

One of the mainl objects of the invention is to provide a packing ofsimple const rucf tion which would be durable and especially adapted foruse under high pressures and high temperatures.'

Another object of the invention is to pro-- vide a packing containinglead inserts, and

to so secure the lead inserts in the packing that all danger ofseparation of the leadv from the fibrous and rubber portions of thepacking isavoided. u Another object of the invention is'to so arrangethe lead finserts that they will form a4v practically continuousannularlineI of contact between the lead and the moving partl to be packed.

Another object of the invention is to pro- .Vide corrugated lead insertswhich are individually and independently wrapped with a suitable numberof layers of rubbercoated fabric 'and then combined in the packing,v thesaid wrapped inserts being permanently secured between a suitable numberof fiat layers of rubber-coated fabric. p

-Another object of the invention is to provide a acking having leadinserts, with an air cus ion whereby said packing will be renderedflexible and yielding to the desired degree. n

vThere are other objects and advanta es of the invention which willappear here1nafter.' ,c

ln the drawing, Figure 1 is a perspective View of a packing stripconstructed in accordance with my invention; Fig. 2 a similar view of apacking strip, the air cushion and the fabric inclosing and bindingstrip being omitted; Fig. 3 a transverse sectional view of the leadinserts with their individual wrapping strips as they are arrangedbefore being compressed in the completed packing strip; Fig. 4 y atransverse sectional' 4View of the strip as shown in Fig. 2, with abinding strip applied; Fig. 5 a detail view of a portion of the bias-cutfabric which is wound around the metal inserts; and Fig. 6 a similarview of a part of the bias-cut rubber-coated fabric of which the flatlayers of the packing are formed.

The lead inserts l are corrugated as shown in Figs. 1 and 4, and eachinsert is individually wrapped with a suitable num- ,be'r of layers ofrubber-coated fabric 2.

These wrapped inserts are assembled, as

suitable number of fiat layers of rubbercoated fabric 3. These assembledparts are then subjected to pressure to thoroughly unite all of therubber parts and to form the packing into a substantially homogeneousmass, asshown in Fig. 2. The layers of fabric around the lead insertsare distorted and compressed sufficiently to reduce Ashown in Fig. 3,and placed between a I rangement ofthe inserts is to provide a. i

substantially continuous line of bearing betweenv the lead and the rodor other part to be packed. By` individually wrapping each corrugatedlead insert they vwill be permanently anchored inthe packing and it willbe impossible for themlto become loosened in use. The wrappings ofrubbercoated fabric will become thoroughly interlocked with the4corruagzated lead inserts when the packing strip ,is subjected topressure as described. When the packing has been brought to thecondition described it is in what is termed the green state, 'the rubberbeing then in a sticky or gum-like condition, :sufliciently adhesive tohold the )arts in their compressed condition. lf it 1s desired that thelead inserts shall be eX- posed upon the inner and outer surfaces ofIMF@ bias-cut rubber-coated fabric wrapped about each of said inserts,the said inserts being arranged in a mass, bias-cut rubber-coated fabriclayers forming the flat sides of the 5 packing, the mass of wrappedinserts lying between said fabric layers, whereby the ends of al1 thethreads of the fabric in the packingwill be exposed on the wearing faceof the packing.

In testimony whereof I hereunto aix -my 10 signature.

CHARLES I. E. MASTIN.

